package com.localjoycommunity.cpdj.common.utils.file;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.UUID;

import com.localjoycommunity.cpdj.common.utils.DateUtils;
import org.apache.commons.io.FilenameUtils;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.http.ResponseEntity;
import org.springframework.web.multipart.MultipartFile;
import com.localjoycommunity.cpdj.common.constant.Constants;
import com.localjoycommunity.cpdj.common.exception.file.FileNameLengthLimitExceededException;
import com.localjoycommunity.cpdj.common.exception.file.FileSizeLimitExceededException;
import com.localjoycommunity.cpdj.common.exception.file.InvalidExtensionException;
import com.localjoycommunity.cpdj.common.utils.StringUtils;
import com.localjoycommunity.cpdj.common.utils.security.Md5Utils;
import com.localjoycommunity.cpdj.framework.config.TwoNewPartyConfig;

/**
 * 文件上传工具类
 *
 * @author LeePandar
 */
public class FileUploadUtils {
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;

    /**
     * 默认上传的地址
     */
    private static String defaultBaseDir = TwoNewPartyConfig.getProfile();

    private static int counter = 0;

    public static String getDefaultBaseDir() {
        return defaultBaseDir;
    }

    public static void setDefaultBaseDir(String defaultBaseDir) {
        FileUploadUtils.defaultBaseDir = defaultBaseDir;
    }

    /**
     * 以默认配置进行文件上传
     *
     * @param file 上传的文件
     * @return 文件名称
     * @throws Exception
     */
    public static final String upload(MultipartFile file) throws IOException {
        try {
            return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 根据文件路径上传
     *
     * @param baseDir 相对应用的基目录
     * @param file    上传的文件
     * @return 文件名称
     * @throws IOException
     */
    public static final String upload(String baseDir, MultipartFile file) throws IOException {
        try {
            return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
        } catch (Exception e) {
            throw new IOException(e.getMessage(), e);
        }
    }

    /**
     * 文件上传
     *
     * @param baseDir   相对应用的基目录
     * @param file      上传的文件
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException       如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException                          比如读写文件出错时
     * @throws InvalidExtensionException            文件校验异常
     */
    public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, IOException, FileNameLengthLimitExceededException,
            InvalidExtensionException {
        int fileNamelength = file.getOriginalFilename().length();
        if (fileNamelength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
            throw new FileNameLengthLimitExceededException(FileUploadUtils.DEFAULT_FILE_NAME_LENGTH);
        }

        assertAllowed(file, allowedExtension);

        String fileName = extractFilename(file);

        File desc = getAbsoluteFile(baseDir, fileName);
        file.transferTo(desc);
        String pathFileName = getPathFileName(baseDir, fileName);
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file) {
        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        fileName = DateUtils.datePath() + "/" + encodingFilename(fileName) + "." + extension;
        return fileName;
    }

    private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.getParentFile().exists()) {
            desc.getParentFile().mkdirs();
        }
        if (!desc.exists()) {
            desc.createNewFile();
        }
        return desc;
    }

    private static final String getPathFileName(String uploadDir, String fileName) throws IOException {
        int dirLastIndex = TwoNewPartyConfig.getProfile().length() + 1;
        String currentDir = StringUtils.substring(uploadDir, dirLastIndex);
        String pathFileName = Constants.RESOURCE_PREFIX + "/" + currentDir + "/" + fileName;
        return pathFileName;
    }

    /**
     * 编码文件名
     */
    private static final String encodingFilename(String fileName) {
        fileName = fileName.replace("_", " ");
        fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
        return fileName;
    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException {
        long size = file.getSize();
        if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
            throw new FileSizeLimitExceededException(DEFAULT_MAX_SIZE / 1024 / 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            } else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            } else {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }

    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
        for (String str : allowedExtension) {
            if (str.equalsIgnoreCase(extension)) {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file) {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension)) {
            extension = MimeTypeUtils.getExtension(file.getContentType());
        }
        return extension;
    }

    /**
     * 文件上传
     *
     * @param file
     * @param dirUrl 在config.properties配置的路径的名称
     * @return
     */
    public static String fileUpload(MultipartFile file, String dirUrl) {
//        String path = ConfigPropertiesUtils.configProperties.getProperty(dirUrl);
        if (file == null || file.getSize() < 0) {
            return null;
        }
        // 将上传的文件拷贝到目录
        String fileName = UUID.randomUUID().toString();
        String originalName = file.getOriginalFilename();
        if (org.apache.commons.lang3.StringUtils.isBlank(originalName)) {
            return null;
        }
        String suffixFileType = originalName.substring(originalName.lastIndexOf("."), originalName.length());
//        Path uploadFolderPath = Paths.get(path);
        Path uploadFolderPath = Paths.get(dirUrl);
        Path uploadFilePath = uploadFolderPath.resolve(fileName + suffixFileType);
        try {
            Files.copy(file.getInputStream(), uploadFilePath);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return fileName + suffixFileType;
    }

    /**
     * nginx文件上传
     *
     * @param file
     * @param uploadUrl
     * @return
     */
    public static String fileUploadByNginx(MultipartFile file, String uploadUrl) {
        if (file == null || file.getSize() < 0) {
            return null;
        }
        // 将上传的文件拷贝到目录
        String fileName = UUID.randomUUID().toString();
        String originalName = file.getOriginalFilename();
        if (org.apache.commons.lang3.StringUtils.isBlank(originalName)) {
            return null;
        }
        String suffixFileType = originalName.substring(originalName.lastIndexOf("."), originalName.length());
        Path uploadFolderPath = Paths.get(uploadUrl);
        Path uploadFilePath = uploadFolderPath.resolve(fileName + suffixFileType);
        try {
            Files.copy(file.getInputStream(), uploadFilePath);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return fileName + suffixFileType;
    }

    /**
     * 查看上传的图片
     * @param url
     * @param filename
     * @return
     */
    public static ResponseEntity<Resource> getFileByUrl(String url, String filename){
        Resource file = null;
        try {
            Path filePath = Paths.get(url).resolve(filename);
            Resource resource = new UrlResource(filePath.toUri());
            if (resource.exists() || resource.isReadable()) {
                file = resource;
            } else {
                file = null;
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        if (file == null) {
            return ResponseEntity.notFound().build();
        } else {
            return ResponseEntity.ok().body(file);
        }
    }
}
